i have to go with the majority on this one as well my first play through i always do the most i can to be good as possible.which is weird cuz normally in games and movies i like the villians more so you would think in games i would be a big jerk.but nope i play as good as i can

Usually, since they get to be able to explore post-game, I go with being a nice guy to as many groups as possible. However, once I get insanely powerful in games like New Vegas, I tend to save beforehand and then go on rampages getting revenge against everyone who I had to bend over to be good for.